Simulation of GPS radio occultation signals through Sporadic-E using the multiple phase screen method

2021 ◽  
Vol 214 ◽  
pp. 105538
Author(s):  
Daniel W. Stambovsky ◽  
Jonah J. Colman ◽  
Omar A. Nava ◽  
Daniel J. Emmons
Keyword(s):  
Radio Occultation ◽  
Phase Screen ◽  
Gps Radio Occultation ◽  
Screen Method ◽  
Multiple Phase ◽  
Sporadic E

Simulated GPS radio occultation signals from sporadic-E layers

2020 ◽  
Author(s):  
Daniel Emmons
Keyword(s):  
Radio Occultation ◽  
Plasma Frequency ◽  
Signal Amplitude ◽  
Scintillation Index ◽  
Gps Radio Occultation ◽  
Multiple Phase ◽  
Maximum Variance ◽  
Sporadic E Layers ◽  
Sporadic E ◽  
Screen Model

<p>A multiple phase screen model is used to simulate GPS radio occultation signals through varying sporadic-E layers.  The length, vertical extent, and plasma frequency of the sporadic-E layers are varied to analyze the effect on the signal received by a low earth orbiting satellite.  A nonlinear relationship between the maximum variance in the signal amplitude and the plasma frequency is observed.  For certain frequency ranges, the predictions match previous studies that have used the S<sub>4 </sub>scintillation index to predict fbEs values. Additionally, the spectra of the signals are analyzed as a function of the different parameters providing an alternative approach for extracting sporadic-E parameters from GPS radio occultation measurements. </p>

scholarly journals Tidal wind shear observed by meteor radar and comparison with sporadic E occurrence rates based on GPS radio occultation observations

2019 ◽  
Vol 17 ◽  
pp. 213-224
Author(s):  
Christoph Jacobi ◽  
Christina Arras
Keyword(s):  
Wind Shear ◽  
Radio Occultation ◽  
Signal To Noise Ratio ◽  
Lower Thermosphere ◽  
Horizontal Component ◽  
Meteor Radar ◽  
Good Correspondence ◽  
Gps Radio Occultation ◽  
Middle Latitudes ◽  
Sporadic E

Abstract. We analyze tidal (diurnal, semidiurnal, terdiurnal, quarterdiurnal) phases and related wind shear in the mesosphere/lower thermosphere as observed by meteor radar over Collm (51.3∘ N, 13.0∘ E). The wind shear phases are compared with those of sporadic E (Es) occurrence rates, which were derived from GPS radio occultation signal-to-noise ratio (SNR) profiles measured by the COSMIC/FORMOSAT-3 satellites. At middle latitudes Es are mainly produced by wind shear, which, in the presence of a horizontal component of the Earth's magnetic field, leads to ion convergence in the region where the wind shear is negative. Consequently, we find good correspondence between radar derived wind shear and Es phases for the semidiurnal, terdiurnal, and quarterdiurnal tidal components. The diurnal tidal wind shear, however, does not correspond to the Es diurnal signal.

Global ionosonde and GPS radio occultation sporadic-E intensity and height comparison

2020 ◽  
Vol 199 ◽  
pp. 105200
Author(s):  
Joshua Y. Gooch ◽  
Jonah J. Colman ◽  
Omar A. Nava ◽  
Daniel J. Emmons
Keyword(s):  
Radio Occultation ◽  
Gps Radio Occultation ◽  
Sporadic E

Global Sporadic E Layer Characteristics Obtained from GPS Radio Occultation Measurements

2013 ◽  
pp. 207-221 ◽  
Author(s):  
Christina Arras ◽  
Jens Wickert ◽  
Christoph Jacobi ◽  
Georg Beyerle ◽  
Stefan Heise ◽  
...  
Keyword(s):  
Radio Occultation ◽  
Gps Radio Occultation ◽  
Sporadic E Layer ◽  
Sporadic E

Effect of sporadic E clouds on GPS radio occultation signals

2010 ◽  
Vol 37 (18) ◽  
pp. n/a-n/a ◽  
Author(s):  
Z. Zeng ◽  
S. Sokolovskiy
Keyword(s):  
Radio Occultation ◽  
Gps Radio Occultation ◽  
Sporadic E

scholarly journals Multiple phase screen modeling of ionospheric scintillation along radio occultation raypaths

Radio Science ◽  
2011 ◽  
Vol 46 (6) ◽  
Author(s):  
Charles S. Carrano ◽  
Keith M. Groves ◽  
Ronald G. Caton ◽  
Charles L. Rino ◽  
Paul R. Straus
Keyword(s):  
Radio Occultation ◽  
Phase Screen ◽  
Ionospheric Scintillation ◽  
Multiple Phase

scholarly journals Comparison of Seasonal foEs and fbEs Occurrence Rates Derived from Global Digisonde Measurements

Atmosphere ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1558
Author(s):  
Dawn K. Merriman ◽  
Omar A. Nava ◽  
Eugene V. Dao ◽  
Daniel J. Emmons
Keyword(s):  
Southern Hemisphere ◽  
Lower Limit ◽  
Northern Hemisphere ◽  
Radio Occultation ◽  
Austral Summer ◽  
Peak Frequency ◽  
Boreal Summer ◽  
Gps Radio Occultation ◽  
Drastic Decrease ◽  
Sporadic E

A global climatology of sporadic-E occurrence rates (ORs) based on ionosonde measurements is presented for the peak blanketing frequency, fbEs, and the ordinary mode peak frequency of the layer, foEs. ORs are calculated for a variety of sporadic-E frequency thresholds: no lower limit, 3, 5, and 7 MHz. Seasonal rates are calculated from 64 Digisonde sites during the period 2006–2020 using ionograms either manually or automatically scaled with ARTIST-5. Both foEs and fbEs ORs peak in the Northern Hemisphere during the boreal summer, with a decrease by roughly a factor of 2–3 in fbEs rates relative to foEs rates without a lower threshold on the sporadic-E intensity. This ratio of foEs to fbEs OR increases with increasing sporadic-E intensity, up to a factor of 5 for the 7 MHz threshold. An asymmetry is observed with the Southern Hemisphere peaks during the austral summer, with slightly lower rates compared with the Northern Hemisphere during the boreal summer. A drastic decrease in ORs is observed for the higher intensity thresholds, such that the fbEs occurrence rates for 7 MHz are nearly zero during most locations and seasons. These updated occurrence rates can be used for future statistical comparisons with GPS radio occultation-based sporadic-E occurrence rates.

scholarly journals Global morphology of ionospheric sporadic E layer from the FormoSat-3/COSMIC GPS radio occultation experiment

GPS Solutions ◽  
2018 ◽  
Vol 22 (4) ◽  
Author(s):  
Lung-Chih Tsai ◽  
Shin-Yi Su ◽  
Chao-Han Liu ◽  
Harald Schuh ◽  
Jens Wickert ◽  
...  
Keyword(s):  
Radio Occultation ◽  
Gps Radio Occultation ◽  
Sporadic E Layer ◽  
Sporadic E
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